Java Reference
In-Depth Information
throws IOException,ServletException
{
int sum=0;
try
{
String value1 = request.getParameter("Num1");
String value2 = request.getParameter("Num2");
int num1=Integer.parseInt(value1);
int num2=Integer.parseInt(value2);
sum = num1 + num2;
}
catch(NumberFormatException nfEx)
{
sendPage(response, "*** Invalid entry! ***");
return;
}
HttpSession adderSession = request.getSession();
adderSession.putValue("sum",new Integer(sum));
/*
Second argument to
putValue
must be a class
object, not a value of one of the primitive
types, so an object of class
Integer
is
created above.
*/
Cookie[] cookie = request.getCookies();
int numCookies = cookie.length;
for (int i=0; i<numCookies; i++)
adderSession.putValue(
cookie[i].getName(),cookie[i].getValue());
if (adderSession.getValue("fi rstVisit") == null)
//First visit, soredirect to preferences servlet.
response.sendRedirect("GetPreferences");
else
response.sendRedirect("ShowSum");
}
private void sendPage(HttpServletResponse reply,
String message) throws IOException
{
reply.setContentType("text/HTML");
PrintWriter out = reply.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>Result</TITLE>");
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